kernel/drivers/tty/serial/earlycon.c, branch linux-4.1.y

earlycon: Revert log warnings

2015-05-08T12:20:50Z

Log warnings meant to help diagnose problems setting up earlycon are reporting false positives for 'console='. Revert to the previous behavior which reported nothing. Cc: Maciej W. Rozycki Cc: Robert Schwebel Signed-off-by: Peter Hurley Signed-off-by: Greg Kroah-Hartman

serial: earlycon: Enable earlycon without command line param

2015-03-26T16:25:27Z

Earlycon matching can only be triggered if 'earlycon=...' has been specified on the kernel command line. To workaround this limitation requires tight coupling between arches and specific serial drivers in order to start an earlycon. Devicetree avoids this limitation with a link table that contains the required data to match earlycons. Mirror this approach for earlycon match by name. Re-purpose EARLYCON_DECLARE to generate a table entry which associates name with setup() function. Re-purpose setup_earlycon() to scan this table for an earlycon match, which is registered if found. Declare one "earlycon" early_param, which calls setup_earlycon(). This design allows setup_earlycon() to be called directly with a param string (as if 'earlycon=...' had been set on the command line). Re-registration (either directly or by early_param) is prevented. Acked-by: Rob Herring Signed-off-by: Peter Hurley Signed-off-by: Greg Kroah-Hartman

serial: earlycon: Refactor earlycon registration

2015-03-26T16:25:27Z

Separate earlycon matching from registration; add register_earlycon which initializes and registers the matched earlycon. Acked-by: Rob Herring Signed-off-by: Peter Hurley Signed-off-by: Greg Kroah-Hartman

serial: earlycon: Skip parse_options() if empty string

2015-03-26T16:25:27Z

Earlycon param strings of the form earlycon= are rejected from parse_options() with an error (which, in turn, results in a NULL argument for the setup() method options parameter). Only pass non-empty string to parse_options(); this will enable handling actual parse errors differently than expected and allow formats. Acked-by: Rob Herring Signed-off-by: Peter Hurley Signed-off-by: Greg Kroah-Hartman

serial: earlycon: Ignore parse_options() error code

2015-03-26T15:17:56Z

Because setup_earlycon() continues to attempt console registration if an error occurred parsing the option string, the actual value of the error code from parse_options() is ignored. Acked-by: Rob Herring Signed-off-by: Peter Hurley Signed-off-by: Greg Kroah-Hartman

serial: earlycon: Move ->uartclk initialize

2015-03-26T15:17:55Z

Initializing the ->uartclk field is not related to option parsing; relocate from parse_options() to setup_earlycon() (which mirrors the behavior of of_setup_earlycon()). Acked-by: Rob Herring Signed-off-by: Peter Hurley Signed-off-by: Greg Kroah-Hartman

serial: earlycon: Refactor parse_options into serial core

2015-03-07T02:55:07Z

Prepare to support console-defined matching; refactor the command line parameter string processing from parse_options() into a new core function, uart_parse_earlycon(), which decodes command line parameters of the form: earlycon=,io|mmio|mmio32,, console=,io|mmio|mmio32,, earlycon=,0x, console=,0x, Signed-off-by: Peter Hurley Signed-off-by: Greg Kroah-Hartman

tty/serial: earlycon: Fix print for implied MMIO case

2014-11-06T03:45:52Z

For the case in which we just provide an address as an argument to the earlycon console type like: earlycon=msm_serial_dm,0xf991e000 We would report this as an IO port based mapping and not as MMIO. Simple fix to use the port->iotype to decide which message to print. Signed-off-by: Kumar Gala Acked-by: Mark RUtland Signed-off-by: Greg Kroah-Hartman

tty/serial: fix 8250 early console option passing to regular console

2014-06-19T20:07:26Z

In the conversion to generic early console, the passing of options from the early 8250 console to the regular ttyS console was broken. This resulted in the baud rate changing when switching consoles during boot. This feature allows specifying a single console option on the kernel command line rather than both an early console and regular serial tty console. It would be nice to generalize this feature. However, it only works if the correct baud rate can be probed early which is not the case on many platforms which have non-standard UART clock rates. So for now, this is left as an 8250 specific feature. Reported-and-tested-by: Tony Luck Signed-off-by: Rob Herring Cc: Jiri Slaby Signed-off-by: Greg Kroah-Hartman

serial: earlycon: add DT support

2014-05-20T20:19:25Z

This adds the infrastructure to generic earlycon for earlycon setup using DT. The actual setup is not enabled until a following commit to add the FDT parsing. Signed-off-by: Rob Herring Cc: Greg Kroah-Hartman Cc: Jiri Slaby Cc: Arnd Bergmann Acked-by: Grant Likely